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Editorial Team
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Asked: 2026-06-14T02:49:14+00:00

I encountered an assignment question giving me String test = problemnumber3; System.out.println(test.charAt(1)); System.out.println(test.charAt(7)); String

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I encountered an assignment question giving me

String test = "problemnumber3";
System.out.println(test.charAt(1));
System.out.println(test.charAt(7));
String piece = test.charAt(13)+4+"7"+test.charAt(13);
System.out.println(piece);

and asking what is printed. The answer I came up with looking at the code was that it would print

r
n
773

but decided to enter it into BlueJ (what we use in class) to double check. The code printed out

r
n
5573

and I can’t figure out where the 55 is coming from. I’ve checked all the available notes and lecture material I can.
Do the numeric characters from strings add to constants weirdly or what?

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1 Answer

  1. Editorial Team

    It’s the ASCII representation of the character '3', (automatic conversion) with 4 added to it. 48 is '0', 49 is '1', so 51 is '3'. Then the compiler adds 4 to get 55, then Java’s String automatically converts the 55 to a String representation of 55 when you do + "7".

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